
Matlab, Fourth Edition: A Practical Introduction to Programming and Problem Solving
4th Edition
ISBN: 9780128045251
Author: Stormy Attaway Ph.D. Boston University
Publisher: Elsevier Science
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Chapter 4, Problem 16E
To determine
To write: A
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Question 4
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0/2 pts 299
A newsgroup is interested in constructing a 99% confidence interval for the difference in the proportions of
Texans and New Yorkers who favor a new Green initiative. Of the 547 randomly selected Texans surveyed,
438 were in favor of the initiative and of the 563 randomly selected New Yorkers surveyed, 458 were in
favor of the initiative.
A. Create a 99% confidence interval to estimate the difference in the proportions of Texans and New
Yorkers who favor a new Green initiative (P1 P2, where population 1 is Texans & population 2 is New
Yorkers)
Enter your answer as an open-interval (i.e., parentheses) accurate to 3 decimal places. Example: (3.24,
9.21)
B. According to your confidence interval...
O With 99% confidence, the proportion of Texans who support the initiative is larger by 4.8 to 7.4
percentage points
With 99% confidence, the proportion of New Yorkers who support the initiative is larger by 4.8 to 7.4
percentage points
At 99% confidence, our data is…
Question 3
0/1 pt 2
Early-childhood-development studies indicate that the more often a child is read to from birth, the earlier
the child begins to read. A local parents' group wants to test this and samples families with young children,
finding the following results:
read to at least 3 times per
week
read to fewer than 3 times per
week
started reading before age
50
36
33
53
4
started reading after age 4
A. Create a 90% confidence interval to estimate the true difference between the proportions of children
who read at an early age when read to frequently, compared to those children who read to less often (
P1 - P2, where population 1 is frequently-read-to-children & population 2 is not-frequently-read-to-
children)
Enter your answer as an open-interval (i.e., parentheses) accurate to 3 decimal places. Example: (3.24,
9.21)
B. According to your confidence interval...
O With 90% confidence, the proportion of children who start reading by age 4 is between 0.075 and
0.321 lower among…
statistics and probability question.
Chapter 4 Solutions
Matlab, Fourth Edition: A Practical Introduction to Programming and Problem Solving
Ch. 4 - Prob. 4.1PCh. 4 - Prob. 4.2PCh. 4 - Prob. 4.3PCh. 4 - Prob. 4.4PCh. 4 - Prob. 4.5PCh. 4 - Prob. 1ECh. 4 - Prob. 2ECh. 4 - Prob. 3ECh. 4 - Prob. 4ECh. 4 - Prob. 5E
Ch. 4 - Prob. 6ECh. 4 - Prob. 7ECh. 4 - Prob. 8ECh. 4 - Prob. 9ECh. 4 - Prob. 10ECh. 4 - Prob. 11ECh. 4 - Prob. 12ECh. 4 - Prob. 13ECh. 4 - Prob. 14ECh. 4 - Prob. 15ECh. 4 - Prob. 16ECh. 4 - Prob. 17ECh. 4 - Prob. 18ECh. 4 - Prob. 19ECh. 4 - Prob. 20ECh. 4 - Prob. 21ECh. 4 - Prob. 22ECh. 4 - Prob. 23ECh. 4 - Prob. 24ECh. 4 - Prob. 25ECh. 4 - Prob. 26ECh. 4 - Prob. 27ECh. 4 - Prob. 28ECh. 4 - Prob. 29ECh. 4 - Prob. 30E
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